Electric bells



Nov. 1, 1955 o. w. HENRIKSON 2,722,635

ELECTRIC BELLS Filed June 2, 1951 FIG. I l9 l8' l8 I5 2e' 26 I l :1 I I2 l l3 l i 'I I. l2

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ATTORNEY United States Patent 1 2,722,635 ELECTRIC BELLS Oscar W. Henrikson, Chicago, Ill., assignor to Automatic Electric Laboratories, Inc., Chicago, Ill., a corporation of Delaware Application June 2, 1951, Serial No. 229,623 3 Claims. (Cl. 317171) This invention relates to electric bells or ringers and more particularly to electromagnetic ringers for use on telephone lines.

It is an object of this invention to provide a more efficient and compact assembly of the bell parts.

It is another object of this invention to provide an improved arrangement whereby the bell can be more readily adjusted to respond to a specific frequency of alternating current.

A feature of the invention relates to the arrangement by which certain parts of the bell cooperate in locating and holding each other in place.

Another feature of the invention relates to an arrangement which permits the armature gap and the bell stroke to be changed by a single adjustment.

Other objects and features not specifically enumerated will be apparent after a consideration of the following description and the appended claims.

The invention will be understood more clearly from the following description based on the accompanying drawing, in which:

Fig. 1 is a plan view of a preferred embodiment of the invention.

Fig. 1A is an elevation of Fig. 1.

Fig. 2 is a plan view of the armature supporting detail.

Fig. 2A is an elevation of Fig. 2.

Fig. 3 is a plan view of the armature and clapper rod assembly.

Fig. 4 is a plan view of one of the bell coils.

Fig. 4A is an elevation of Fig. 4.

Fig. 4B is similar to Fig. 4A and shows the other coil of the bell.

Referring to the drawing, the bell comprises a formed bracket 11 on which the coils 12 and 13 are mounted and held in place by the screws 21 and 21'. The permanent magnet 14 is mounted on the bracket 11 and is held in place by the slots 31 and 31 in the coil 13 cooperating with similar slots in the coil 12. Another similar unit 14', which may be another permanent magnet or a supporting member preferably of soft magnetic iron, is held in place on the bracket 11 by the slots 32 and 32 in coil 13 cooperating with similar slots in coil 12. The upper end of the permanent magnet 14 and the upper end of the support 14' rest against the armature support 15. The cut-outs 30 and 30' fit into the slots 26' and 26 of coils 12 and 13, respectively. When the screws 21 and 21' are tightened the permanent magnet 14 and the support 14' are held in place by the armature support 15 and in turn, in cooperation with the slots 26 and 26', hold the armature support 15 in its proper position.

The reed 19 is similar to the reed shown in Fig. of Patent 1,062, 86 issued to Charles I. Erickson May 27, 1913. The armature and clapper rod assembly (Fig. 3) is attached to the reed and held in place by the round nut 18 and the hexagonal nut 18. This reed in conjunction with the armature and clapper provide for arranging the bell so that it will respond only to a specific frequency of alternating current. This feature is well known and is described in the forementioned Erickson patent. The clapper rod 17 is inserted through the cut-out 27 in armature support and the reed 19 and the armature and clapper rod assembly are held in place by the screws 20 and 20' for which the tapped holes 28 and 28 are provided. The gap between the armature 16 and the cores of the coils 12 and 13 is controlled by turning the nuts 18 and 18. Increasing or decreasing the gap between the armature 16 and the cores of the coils 12 and 13 is accompanied by a corresponding change in the length of the clapper rod in relation to the reed 19.

The gongs 24 and 24 are mounted eccentrically on the bracket 11 so that by turning the gongs around the screws 25 and 25 favorable contact between the gongs 24 and 24' and the clapper 22 can be obtained. The clapper 22 is held in place on the clapper rod 1'7 by the screw 23.

As the movement of the armature 16 in relation to the cores of the coils also causes a change in the length of the clapper rod 17 in relation to the reed 19 a relatively small movement of the armature will have a great eifect on the electrical performance of the bell. The gongs 25 and 25 are adjustable so that the position of the clapper 22 need not be changed if the length of the clapper rod 17 is changed.

While one particular embodiment has been described herein, it will be understood that various changes may be made therein without departing from the spirit and scope of the invention.

What is claimed is:

1. In an electric bell, a pair of electromagnets, a permanent magnet, 21 support for said electromagnets and said permanent magnet, a detail for mounting an armature, guides on said electromagnets for said detail, other guides on said electromagnets for said permanent magnet, means tor assembling together in fixed relationship said permanent magnet, said electromagnets, said support and said detail, means for engaging said detail with said first mentioned guides, and means for engaging said permanent magnet with said detail and said other guides and said support whereby said first mentioned guides and said detail locate and secure said permanent magnet in position and said other guides and said permanent magnet locate and secure said detail in position.

2. In an electric bell, an armature mounting detail, a plurality of coils, a permanent magnet, means for assembling said parts together so that each part has a definite position in relation to the others of said parts, guides on said coils, means for engaging said armature mounting detail with said permanent magnet, means for engaging said armature mounting detail with some of said guides, means for engaging said permanent magnet with other of said uides, and means including said three last mentioned means for securing said armature mounting detail and said permanent magnet in position.

3. In an electric bell, a pair of coils, a permanent magnet, a mounting detail, a bracket, first slots on said coils for receiving said permanent magnet, other slots on said coils for receiving said mounting detail, means for assembling said coils and said permanent magnet on said bracket and for engaging portions of said permanent mag net with the first slots on each of said coils whereby lateral movement of said permanent magnet is prevented, and means for engaging said mounting detail with said other slots of said coils and for securing said mounting detail in contact with said permanent magnet whereby said bracket and said mounting detail prevent longitudinal movement of said permanent magnet.

References Cited in the file of this patent UNITED STATES PATENTS 902,105 North Oct. 27, 1908 924,030 Birsfield June 8, 1909 978,864 Erickson Dec. 20, 1910 1,062,586 Erickson May 27, 1913 1,096,287 Craft May 12, 1914 1,125,495 Dean Jan. 19, 1915 1,293,387 Erickson Feb. 4, 1919 

